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Who Cites hd?
hdDef  hd(l) == Case of l; nil  "?" ; h.t  h
Thm*  A:Type, l:A List. ||l|| hd(l A

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listlist_indnatural_number
tokenuniversememberimpliesall!abstraction
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WhoCites Definitions DiscreteMath Sections DiscrMathExt Doc